This Low Alloy High Strength Billet Q390B is designed to meet the requirements of modern engineering projects where higher strength compared to some common grades is needed while maintaining good formability and weldability. The carefully controlled chemical composition and defined mechanical properties ensure its suitability for a wide range of structural applications.
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Product details
Q390B Low Alloy High Strength Billet is a remarkable structural steel material that stands out in the construction and engineering sectors. Adhering to the GB/T 1591-2008 standard, it offers a host of excellent features that make it highly sought-after for a wide variety of projects demanding strength, durability, and reliability.
| Parameter | Value | Remarks |
|---|---|---|
| Standard | GB/T 1591-2008 | Specification for low alloy high-strength structural steel |
| Grade | Q390B | Impact tested at 20℃ |
| Chemical Composition (wt%) | ||
| – Carbon (C) | ≤0.20 | |
| – Silicon (Si) | ≤0.55 | |
| – Manganese (Mn) | ≤1.70 | |
| – Phosphorus (P) | ≤0.040 | |
| – Sulfur (S) | ≤0.040 | |
| – Niobium (Nb) | ≤0.07 | Microalloying element to enhance properties |
| – Vanadium (V) | ≤0.20 | |
| – Titanium (Ti) | ≤0.20 | |
| – Aluminum (Al) | ≥0.015 | For deoxidation purposes |
| – Nitrogen (N) | ≤0.015 | |
| Mechanical Properties | ||
| – Yield Strength (ReL) | ≥390 MPa | For thickness ≤16mm; for thicknesses over that range, specific values vary accordingly |
| – Tensile Strength (Rm) | 490 – 650 MPa | |
| – Elongation (A) | ≥20% | |
| – Impact Energy (Akv) | ≥34 J | At 20℃, with longitudinal specimens |
| – Bending Test | 180° | Bend diameter: 2a for ≤16mm; 3a for >16mm (where ‘a’ represents the thickness of the billet) |
| Delivery Condition | Hot rolled, normalized, normalized + tempered, TMCP (Thermo-Mechanical Control Process) etc. | As per customer’s specific requirements |
| Typical Applications | Used in construction of bridges, high-rise buildings, heavy machinery frames, and other structures that demand high strength and good toughness |
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